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Method for producing water-soluble ammonium polyphosphate by using extraction wet-process phosphoric acid

A technology of ammonium polyphosphate and wet-process phosphoric acid, applied in ammonium orthophosphate fertilizers, chemical instruments and methods, alkaline orthophosphate fertilizers, etc., can solve problems such as overflow, achieve low production cost, short reaction time, The effect of less impurities

Active Publication Date: 2018-08-10
佳瑞科(武汉)国际贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Urea is easy to decompose to generate a large amount of ammonia and carbon dioxide gas, which will form a large amount of foam during the polymerization process and cause overflow

Method used

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  • Method for producing water-soluble ammonium polyphosphate by using extraction wet-process phosphoric acid
  • Method for producing water-soluble ammonium polyphosphate by using extraction wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Ammonia gas is continuously fed into a reactor for extracting wet-process phosphoric acid with 2000Kg20% content, reacted at 110°C to generate monoammonium phosphate, and the reaction time is 120 minutes. The reaction solution is concentrated by hot filtration, frozen crystallization, centrifuged Separation to obtain crude monoammonium phosphate and a primary mother liquor; the crude monoammonium phosphate is washed with triethylamine lye to obtain 400kg monoammonium phosphate crystals and a secondary mother liquor; the triethylamine lye in the secondary mother liquor is recovered to obtain a third mother liquor , Triethylamine lye is applied mechanically, the primary mother liquor and the third mother liquor are combined and discharged, and enter the system for producing industrial grade monoammonium phosphate by other methods.

[0036] (2) Turn on the heating device, raise and maintain the temperature of the fixed bed reactor at 350°C, add ammonium hydrogen phospha...

Embodiment 2

[0039] (1) Ammonia gas is continuously fed into a reactor with 1000Kg50% content to extract wet-process phosphoric acid, reacted at 80°C to generate monoammonium phosphate, the reaction time is 60 minutes, concentrated through hot filtration, frozen crystallization, and centrifuged to obtain Monoammonium phosphate crude product and primary mother liquor; The monoammonium phosphate crude product is washed with monoethanolamine lye to obtain 500kg monoammonium phosphate crystals and secondary mother liquor; the lye in the secondary mother liquor is recovered and processed to obtain three mother liquors, and monoethanolamine lye is used mechanically. The primary mother liquor and the tertiary mother liquor are combined and discharged, and enter the system for producing industrial grade monoammonium phosphate by other methods.

[0040] (2) Turn on the heating device, raise and maintain the temperature of the fixed bed reactor at 200°C, continuously add ammonium hydrogen phosphate s...

Embodiment 3

[0043] (1) Ammonia gas is continuously fed into a reactor with 500Kg85% content to extract wet-process phosphoric acid, and reacted at 100°C to generate monoammonium phosphate. The reaction time is 100 minutes, concentrated by hot filtration, frozen and crystallized, and centrifuged to obtain Monoammonium phosphate crude product and primary mother liquor; Monoammonium phosphate crude product is washed with ethylenediamine lye to obtain 415kg monoammonium phosphate crystals and secondary mother liquor; ethylenediamine lye in secondary mother liquor is recovered to obtain three mother liquors, ethylenediamine The amine lye is used mechanically, and the primary mother liquor and the tertiary mother liquor are combined and discharged, and enter the system for producing industrial grade monoammonium phosphate by other methods.

[0044] (2) Turn on the heating device, raise the temperature of the fixed bed reactor to and keep it at 250°C, continuously add ammonium hydrogen phosphate ...

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Abstract

The invention discloses a method for producing water-soluble ammonium polyphosphate by using extraction wet-process phosphoric acid. The method comprises the steps that ammonia gas is continuously introduced into an extraction wet-process phosphoric acid reactor and reacts at the temperature of 80-110 DEG C to generate monoammonium phosphate, and heat filtration and concentration, freeze crystallization, centrifugal separation and washing with alkali liquor to obtain monoammonium phosphate crystals; then monoammonium phosphate is continuously added into a fixed bed reactor and melted and condensed into acid type ammonium polyphosphate at the temperature of 200-350 DEG C; finally, under the conditions that the temperature of an atomizing reactor is 150-250 DEG C and the ammonia gas partialpressure is 0.1-3 MPa, a mixture of the acid type ammonium polyphosphate melt and a foaming agent is continuously sprayed into the reactor for neutralization, and white water-soluble ammonium polyphosphate is generated. The nitrogen content of the ammonium polyphosphate product is 15-25%, the phosphorus pentoxide content is 50-65%, the content of N+P2O5 is larger than 76%, the solubility (25 DEG C) in H2O is in 25-75%, the average polymerization degree is 5-15, and the content of water-insoluble substances is less than 0.5%. The production process is low in cost, easy to operate and especiallysuitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of fertilizer preparation, in particular to a production method of agricultural water-soluble ammonium polyphosphate. Background technique [0002] Ammonium polyphosphate is a kind of polyphosphate containing nitrogen and phosphorus, and the content of nitrogen and phosphorus is relatively high. When the degree of polymerization n is greater than 20, it is difficult to dissolve in water, and it is usually called high ammonium polyphosphate, which is a flame retardant widely used in industry; when the degree of polymerization n is 2 to 20, it is usually called water-soluble ammonium polyphosphate, It is an important raw material for liquid fertilizer. In addition, the water-soluble ammonium polyphosphate has stable chemical properties, close to neutral pH, and good solubility; it also contains high nitrogen and phosphorus elements required by plants, and has a strong chelating effect on metal ions, and can a...

Claims

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Application Information

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IPC IPC(8): C01B25/40C05B7/00
CPCC01B25/405C05B7/00
Inventor 胡晓彬徐阳徐谢书徐仁鑫李雅倩徐仁杰
Owner 佳瑞科(武汉)国际贸易有限公司
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